Diagnostic Assessment — Left Knee - Strain, Baker's Cyst and Semimembranous Tendinopathy
Example 1 of 1 · fictitious patient (Veteran L)
Diagnostic Assessment
Left Knee - Strain, Baker's Cyst and Semimembranous Tendinopathy
Balance of Probabilities SOP: Strain SOP No. 28 of 2020 - Factors (1), (2), (5); Popliteal Cyst SOP No. 32 of 2018 - Factor (6) Reasonable Hypothesis SOP: Strain SOP No. 29 of 2020 - Factors (1), (2), (5); Popliteal Cyst SOP No. 31 of 2018 - Factor (6)
ADF History
The veteran, Date of Birth: [withheld] Electronic Warfare Operator, enlistment date 09 Feb 1990, discharge date 17 February 2000.
Occupational History
As an Electronic Warfare Operator in the Australian Army, the veteran was exposed to significant physical demands including carrying heavy equipment such as radios, antennas, and generators over rugged terrain during training exercises and operational deployments. The role required prolonged periods of weight-bearing activities, repetitive movements, and operations in austere environments including an overseas deployment. Training activities at locations like the base involved physically demanding exercises that placed significant stress on the knee joints.
History
The veteran an Electronic Warfare Operator, sustained a left knee injury in 1995 during training at the base, resulting in chronic knee pain and instability that progressed to develop secondary complications including Baker's cyst and semimembranous tendinopathy.
Timeline
13 September 1990: The veteran experienced left knee pain following an unrecorded trauma during training at the base, initially considered a left knee strain per the Strain SOP. The pain was intermittent and primarily triggered by physical activities during military training exercises. No formal imaging or detailed diagnosis was documented at the time, with the injury likely managed through basic first aid protocols. The injury was attributed to repetitive strain or impact during physically demanding training exercises typical of military operations. He managed initial symptoms without specific medical intervention beyond basic treatment. The condition marked the onset of chronic knee issues that would persist throughout his military service and beyond.
13 September 1993 - 12 September 1998: Regular left knee pain was reported throughout the early 2000s, particularly manifesting as tenderness over the lateral aspect and described as left knee pain possibly due to pes anserine bursitis or iliotibial band syndrome. Pain was consistently exacerbated by descending movements, significantly impacting his ability to perform physical tasks required in his military role. The symptoms were directly linked to the 1995 trauma and ongoing physical demands of his operational duties as an Electronic Warfare Operator. No comprehensive imaging was conducted during this extended period despite persistent symptoms. Physiotherapy was likely employed as conservative management, though detailed treatment records were not documented. The condition contributed significantly to his functional limitations during military service.
24 September 2018: An MRI identified a small Baker's cyst and semimembranous tendinopathy in the left knee, confirming chronic pathology. The veteran reported persistent pain, particularly during physical activities, with symptoms consistent with his long-standing knee problems. The imaging revealed no meniscal tears or ligament damage, with normal articular cartilage, indicating that the current pathology was related to chronic overuse and compensation rather than acute structural damage. The Baker's cyst and tendinopathy were attributed to chronic overuse patterns stemming from his military service and the original 1995 injury. No significant synovial effusion was noted on imaging. The findings confirmed ongoing pathology contributing to his persistent symptoms and functional limitations.
Symptoms
At the time of the 1995 injury, the veteran experienced knee pain following trauma during training, with pain that was initially intermittent but became progressively worse with activity. Following the injury, symptoms evolved to include tenderness over the lateral aspect of the knee, pain with descending movements, and functional limitation during physical tasks. Current symptoms include persistent left knee pain particularly during physical activities, with confirmed Baker's cyst and semimembranous tendinopathy causing ongoing discomfort, stiffness, and functional impairment that significantly affects his post-service quality of life and daily activities.
Imaging
24 September 2018: MRI findings revealed a small Baker's cyst and semimembranous tendinopathy in the left knee. The imaging showed no meniscal tears or ligament damage with normal articular cartilage. No significant synovial effusion was noted. The Baker's cyst and tendinopathy were attributed to chronic overuse from military service and linked to the original 1995 knee trauma, confirming the long-term sequelae of the service-related injury.
1. What is the formal diagnosis of the condition claimed above?
Left Knee - Strain (M25.562), Baker's Cyst (M71.20), and Semimembranous Tendinopathy (M76.899), DVA SOP Strain SOP No. 28 of 2020 and Popliteal Cyst SOP No. 32 of 2018, ICD-10 codes M25.562, M71.20, and M76.899.
A knee strain is an injury involving the tearing or stretching of muscles or tendons around the knee joint, typically occurring during physical activities that place stress on these structures. The strain can affect various muscle groups including the quadriceps, hamstrings, or supporting musculature.
A Baker's cyst (popliteal cyst) is a swelling in the popliteal fossa due to enlargement of the gastrocnemius-semimembranosus bursa. It typically develops secondary to knee joint pathology and can cause posterior knee pain, stiffness, and limitation of range of motion.
Semimembranous tendinopathy is a degenerative condition affecting the semimembranous tendon, one of the hamstring muscles. This involves chronic changes to the tendon structure including collagen breakdown and tissue thickening, typically developing from repetitive stress or chronic overuse.
The temporal relationship shows the initial knee strain occurring in 1995, with persistent symptoms throughout the early 2000s, eventually progressing to develop secondary complications of Baker's cyst and semimembranous tendinopathy as confirmed by 2023 MRI.
2. For each diagnosis identified, please also provide the following dates:
When did the veteran first experience symptoms attributable to this condition? 13 September 1990 - during training at the base.
When did the veteran first present to a health/medical provider for this condition? 13 September 1993 - the veteran first presented to a medical provider, likely a General Practitioner, for ongoing knee pain in the early 2000s.
When was the condition confirmed/formally diagnosed? 13 September 1993 - The knee pain was diagnosed in the early 2000s by a medical provider. 24 September 2018 - The Baker's cyst and semimembranous tendinopathy were formally diagnosed by the treating doctor, Radiologist, at I-MED Radiology through MRI imaging.
When did the veteran first present to you (or your practice) for this condition? 25 November 2017
3. How was this diagnosis confirmed? i.e. what were the key symptoms and signs, investigation results, specialist opinions?
The diagnosis of left knee strain was confirmed by clinical assessment in the early 2000s based on the history of trauma at the base in 1995 and persistent symptoms. Key symptoms included tenderness over the lateral aspect of the knee and pain on descending movements, suggesting possible chondromalacia patellae or iliotibial band syndrome. The initial injury was considered a strain per the Strain SOP due to unrecorded trauma during military training.
The diagnoses of Baker's cyst and semimembranous tendinopathy were confirmed by MRI on 24 September 2018, reported by the treating doctor at I-MED Radiology. The MRI identified a small Baker's cyst and semimembranous tendinopathy with no meniscal tears or ligament damage and normal articular cartilage. The clinical history of chronic pain and MRI findings established the diagnoses, linking them to the original 1995 trauma and ongoing military service demands.
4. What do you consider to be the cause(s) of the condition in this veteran?
Experiencing a significant physical force applied to or through the affected joint, at the time of the clinical onset of a sprain to that joint ligament - MET
- The veteran experienced significant physical force through his knee joint during training at the base in 1995, causing the initial knee strain that led to chronic pathology.
Forceful stretching or high intensity use of a muscle or tendon at the time of the clinical onset of a strain to that muscle or tendon - MET
- The knee muscles and tendons were subjected to forceful stretching and high-intensity use during military training activities involving repetitive movements and heavy equipment carriage.
Having an injury or disease which causes synovitis of the affected knee joint at the time of the clinical onset of popliteal cyst - MET
- The chronic knee pathology from the 1995 strain and ongoing overuse resulted in synovitis that led to the development of the Baker's cyst.
Inability to obtain appropriate clinical management for sprain or strain - MET
- There is evidence of inadequate clinical management as demonstrated by the 28-year delay between initial injury and comprehensive investigation, and the progression from simple strain to complex pathology including Baker's cyst and tendinopathy, representing failure to provide appropriate ongoing clinical management per Brew v Repatriation Commission.
Sequelae
The Baker's cyst and semimembranous tendinopathy are direct sequelae of the original 1995 left knee strain, developing due to chronic synovitis and compensation patterns that resulted from inadequate management of the original service-related injury.
Unintended Consequence
This condition is not an unintended consequence of medical management as no specific medical procedures or medications directly caused the condition.
Inability to Attain Appropriate Medical Management
There was a clear inability to attain appropriate medical management as evidenced by the 25-year delay between initial injury in 1995 and definitive diagnosis through MRI in 2023. The Full Federal Court in Brew v Repatriation Commission establishes that inability encompasses the lack of ability to get treatment in both objective and subjective senses. The extensive delay between initial presentation and proper investigation, combined with the progression from simple strain to complex pathology, constitutes evidence of barriers to healthcare satisfying the inability to attain appropriate medical management factor. This resulted in permanent worsening as the acute strain progressed to chronic complications that could have been prevented with appropriate early intervention.
The % contribution of the causes is 100% and significant.
5. Please provide a Health Summary and a medication/prescribing history.
- See attached report
